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(1987) says, 'the basic tenet of plate tectonics, rigid-body movements of large plates of lithosphere, fails apply to continental interiors, where buoyant continental crust can detach from the underlying mantle to form mountain ranges and broad zones of diffuse tectonic activity'. Furthermore, the theory behind plate tectonics is less well developed when it comes to explaining how or why plates move. These latter questions are fundamental to the paradigm and, of course, various attempts have been made to explain the manner in which various features of plate tectonics come into being. It is to these mechanistic problems that this book is addressed.

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